loo Configurations of Alum* 
various Directions, darts frequently through* 
and occupies all or molt of the Spaces be¬ 
tween them, making thereby no ill Repre- 
fentation, when viewed by Candle-Light, 
of a Night-Sky, illuminated with Chining 
Stars and tailed Comets, and rendering 
the whole Scene extremely whimfical and 
pretty. 
Nor do thefe Configurations break away* 
or diffolve, focn after their being form¬ 
ed, as many others do ; but may be pre- 
lerved on the Glafs in good PerfeCtiofi for 
Weeks or Months, if Care be taken neither 
to exclude the Air wholly from them, nor 
put them in a moift Place : for in either 
Cafe they will be foon deftroyed. 
Being defirous to preferve fome exceeding 
fine Star and Comet-like Figures, I fatten¬ 
ed another Glafs of its own Size upon the 
Slip where they w’ere formed ; having firfl 
placed thin Pieces of Cork between, to pre¬ 
vent the Glades from touching, and after 
all flopped the Ends and Sides with Sealing 
Wax, thereby to keep out the Air, which 
I imagined would fpoil them : but contrary 
to my Expectation, in two Days the Figures 
were all obliterated; whereas another Con¬ 
figuration, covered with a Slip of Glafs to 
preferve it from being touched, but whole 
Sides were open to the Air, continued in 
great Perfection at lead two Years, and then 
too was fpoiled by Accident. 
•" • ; ' * The 
